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Which of the following statements about the nucleus of an atom is FALSE:

Which of the following statements about the nucleus of an atom is FALSE:. The nucleus has an overall positive charge. The nucleus takes up a very small amount of space compared to the entire atom. The nucleus contains both proton and neutrons.

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Which of the following statements about the nucleus of an atom is FALSE:

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  1. Which of the following statements about the nucleus of an atom is FALSE: • The nucleus has an overall positive charge. • The nucleus takes up a very small amount of space compared to the entire atom. • The nucleus contains both proton and neutrons. • The nucleus repels the electrons that orbit around it. • The nucleus contains most of the mass of the atom. 60 Countdown

  2. Which of the following processes CANNOT transform one element into a different element (i.e. transmutation)? • Alpha decay • Gamma decay • Beta decay • None of the above 60 Countdown

  3. You have two atoms, one has 6 protons, 6 neutrons, and 6 electrons, and the other has 6 protons, 8 neutrons and 6 electrons. Which of the following best describes the difference between them? • They are two different elements. • They are two different isotopes of the same element. • They are two different ions of the same element. • They are different ions of the same element. • None of the above. 60 Countdown

  4. You have two atoms, one has 6 protons, 6 neutrons, and 5 electrons, and the other has 6 protons, 8 neutrons and 7 electrons. Which of the following best describes the difference between them? • They are two different elements. • They are two different isotopes of the same element. • They are two different ions of the same element. • They are different ions of the same element. • None of the above. 60 Countdown

  5. Uranium and Thorium are the two radioactive elements discovered by Marie Curie. What is your opinion? • True • False 30 Countdown

  6. The X-rays were discovered by J. J. Thompson. Do you agree? • Yes • No 30 Countdown

  7. Let’s consider two radioactive sources. One decays at a rate of 18.5 billion atoms per second, and the other decays at a rate of 74 billion atoms per second. What are their activities in curies? • 2 C and 1/2 C, respectively. • 1/2 C and 2 C, respectively. • 2 C and 3 C, respectively. • None of the above. 120 Countdown

  8. Suppose you have 10 grams of Barium-139 which has a half-life of 86 minutes. After 86 minutes, half of the atoms in the sample would have decayed into another element, Lanthanum-139 (stable isotope). How many grams of Ba-139 and La-139 are present in the sample after 172 minutes? • 2.5 grams and 5 grams, respectively. • 5 grams and 5 grams, respectively. • 2.5 grams and 7.5 grams, respectively. • None of the above. 180 Countdown

  9. Which type of radiation causes the most biological damage to humans after a short exposure? • Gamma rays • Beta particles • X-rays • Alpha particles 30 Countdown

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